SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd934547b609ea7640a586b57d219ec6f8b8d4edca46a39f12cdf77a204df4c3' 
  AND token = 't+Tl2ZjHQmeKwRBXUJiiAi3v60TC62Qx1zH+3IITV8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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