SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1736619007f4d6d36eb318e1dad938bc55928cab9ab9cd4fc2a779613a30ec02' 
  AND token = 'Br/3MYvxMR+B/AwzmUdz1UYFpamAGyVci25hmX23JiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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