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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44d9f594b4bc3d9a93e81db275eec47be41143049a5b77b4df7e0e38fe275ef5' 
  AND token = '9xH2FLy3GzYQ4jklxdkbHNArCA72BkjFItBRUZoP5sM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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