SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59035cb950665370e8fa4592717b81df1d48b5162887efa401112914560f9dfe' 
  AND token = 'h0QQnH6B5Z16RpyKw54JbIiykq+hqazV7OAv+9ZM5Yo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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