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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9e1671b1b3cd71aa78196b8d804716163810b2470d85fa3c6c2f00a85135a41' 
  AND token = 'k6uFJ2RJRS5QwOnga54YcZYolUxTDBzxD5vToTjfdQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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