SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '748ba4db75fc3f2c56897dec5c5d0feadbd350dc98157143f2d071485fa2b90f' 
  AND token = 'kyAQjXDpx6JnKbud9XsUiFj+IHmxz2Yuw2yZh8Zdphc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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