SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59065664d4089b541d521d96c1b643c47c88ae1ecaae09620a1a40417ff52bb7' 
  AND token = 'MOMKPzSgpZ+sKfVs4Ua2yqFHZcIJtVhJHGyK8i++kFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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