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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cd53d691c733d8b464d3857e3bb8af87d2851666a6398a2da4c62c982cbf262' 
  AND token = 'i2utUTJhemps9OTvRUa0LC62DOHOMV5z5FhH76gZLjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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