SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '367ab10c4780dfa509d7a36a8237caab69d11f5f06f6c67536abb3f74b3c5b32' 
  AND token = 'Wq28YNmvKxu/9gaZZFujtYh/up9kDtyEbUP/xhDw/6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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