SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95491f2f8e1ea0fb1b183884be3b56d0646d6877df90f9f787de575e782c145d' 
  AND token = 'FuziVaIJQgM/YqYA3oKrbfzPIQgw254R8R2v94t/2eI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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