SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '665bc000bf4e82518302d49a5847befb7efcc5943a91817fde9c855635ad8eea' 
  AND token = 'tG3VpqV1iJrXJU1ihuwnlsOLbNsRHEq90vBKUPd2lrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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