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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffff3a83ff72d02a9e0e8684c327e1a2c5689f2a1ac17039c10c61a2e7ba5614' 
  AND token = 'hxAWJ0/eirujT9or8j2yWEd30mTZRG3rnATdNo3qtxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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