SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7fd13840f56fb25f606c5bc3a69e1664844d076787320cbc754291c6a701148' 
  AND token = '3lyrYS/zSN/BpVP/dY9O3pXzIC9pXuG7oq6VpEhWmVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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