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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dea68030648fc583ef8761effcd56ad22f7f2d054ce156f0a04a0d9d719e67e' 
  AND token = 'kXMvo3Zf7nOHCvr0mcPwuRh57Ou6tCvkTc12BL0MJzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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