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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c338eced35024c1620d072f56556ea10a86a7acf80dc6e934dc8881a7a2aa3' 
  AND token = 'u8WIByYWgsJe3H6p5fv7J0AQWt5V+9zpIyPbsdXh6l8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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