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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ab4a3681489fe958504876ed568e23d6ddb2d3ec1667dc3d9df2bf95dccf21d' 
  AND token = 'Tuk5ss8CE0H0Du8Ti2bYSYzXqP/xUFLLOY7M1pbBPwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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