Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba255ba75b0f4b7250911606d891ca4fd630a89d14d3c8d31eecc799dabde39f' 
  AND token = '+oN3oh2YPTNFCm7gNsdLkNmbHhomQy7wfQSiNWTVbcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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