SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61635d3c7b449fc37480d8867329ba670a2c8f544c360bc6c91590b71ed0e5ad' 
  AND token = 'oLG97PQiAkGMK3cVioMDAXKCwwj7L5gnaV1/mAFD+jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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