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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db60ab4fb2ac38de25050b3714ced9ea329d48edc871fa864f8d6ac8a85b5c3e' 
  AND token = 'Vc6e1fCcFLGf9u017MqciTbq3gp/mKkz7I2rG5CDekU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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