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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82c9be33b6526b5cb86840b309831471a3592cb54ff17f492e7c20c64a8cba22' 
  AND token = 'pGPIErt3EFd/RUd9vTgsDKFoM+7MS3q++2rgdr1KR1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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