Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1aea0a23a7e6eeb09ef3ae13b2b61c05b3538bf06e93d6b42404adf2dea1a6d' 
  AND token = '428XwYSM/YAkwjCKmaq6uJAfE6ulHSg+fhq1aa0LHp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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