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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd664bd098ace0e3511d6c6c6f81a66ccb0bae1c53aa92a735355a13d183c363' 
  AND token = '+rGrHTeu3QvEvzqYRa1eUeQh2XS0Sl3anMtbamjieok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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