SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d5f7fb9c1515dbadad3a4c09b9229c247d3e3ed06bf9730549683df08dff9b0' 
  AND token = '1Eo4vPvmWw+gQyFNFlnBdlCCSZGksEYihNrhJIwEc5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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