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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa72992a3264474df7e01cbb212caa7296054e004a633e1450ac722319de718c' 
  AND token = 'WBnr0r0HBE+4/BEvqElCf96d9BQGgPjV/PHYkX+sU2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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