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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '888b52f01ad2ddd964140c55efe6dbaa33e132403c70185d73cdcea9a4d30130' 
  AND token = 'ooGrhXS/VIAyprkn6K4Jf21b038hWz6KKvax0+wIZbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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