SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caeb021915d273a944729d008c5187278580f512326f9b06e9f8063a28e693f5' 
  AND token = 'ZUvpuKTeJJ4AYUf4ILjzzljnCMQIUEhr8oJImLTmeh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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