SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7b5ac9fdcc7bfc2078092878faf8089948fe60851db6c91f483c32124b66afb' 
  AND token = 'XVg+S0CixTwG5E7O3WXsYlTBKD4V64EzA0oojAoc3HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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