SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ae3a5ef5be9c17f03917dae6eddbacc8307a7f46b94745350f95255d1b73061' 
  AND token = 'VJHFcZeBewYWrwGURunx8JCaFrijmK87oGpkV7fYOXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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