SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8cf9001632b2c7e482c9ad3a2dd8bb59673e0fad534f2dd8d0878d18905225' 
  AND token = 'ZY/Cr++1tLZ5jgb4HCZ8CohjfvpRrbBres9VIjM6/FI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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