SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95172643f69597bd52184b7ddb5cc0ddaa75efe645473f81bff56243a4b38904' 
  AND token = 'o2zBv7YEuWpV+oWjFQT/Nk6pAry+d0jjqlfS+jznpNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00085

JSON explain

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