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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38589b01e82c1b0db122cbbf474a0d8366a0c9e27f70892be8a56bd1d4f63f73' 
  AND token = 'TjW/my2hCZG1s6RUUPunGQJNAXEKXUcGXPkot1DGGsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}