SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22e7c8a7d38c0daef4c454f70e8cf451bb10e45b0f9d37159d33c95919de8b16' 
  AND token = 'm/67S2ndwVGiUW2JjZz06GKC2m88/PpgmBtOvX9EMPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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