SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'babe93bdaeedb7b0725cc9e5af82f896fb73037b9bf6220429c0f88965746583' 
  AND token = 'q+wAHejfPmtS/OsYqQVH9aaYd4oT3wOwxMBvTl1XjcI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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