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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e18149dcb0e94b9b238765dd1edbfe53b3a17852a751d66ff69140c83cdfeff5' 
  AND token = 'z5d1bvLHgmSv2o0yqGdc3zaq9FyVdN39giuDso055J4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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