SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca7dd89d1be59f6cda3b5c0549e593355a030707c067302bad9235fdd96eb1b7' 
  AND token = 'zkWlYiiWYGGiNgkscGgvBGuVs8JpHITzwjOH1AjhAas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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