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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89699c94477a67f4d14d8f3771d06fae0edc543726a85b5e9013e0eb81e8fc74' 
  AND token = 'A8VwK2u4m4VHP+d5MxKyOVQNJgW6nqUT084A3DTDBK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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