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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23591c520a3f2ab6572f4f9304e63f931f35b6bee59e59b27557213c447668c4' 
  AND token = 'MdMlXaolPwI0MnwHKq+eG21vSMO6+BCn74pYtXFhAVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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