SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '153cd55fbf9603dbb6bd71fd7c96f2bb1757f3903979f507a6f85a61fa8ad275' 
  AND token = 'yqrIwm89gEFdXni4AR4z7J4/paRWhOFWQjvOKFjnO7Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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