SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfa3ec619e851efabd1fc6f8774c0b826bc887404ef73a7804d7123ac2978e6e' 
  AND token = 'JI3pQKvjkzYJzpI06SPelq2uYLG8Rey59h4RkuUjGUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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