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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6897f038811f129450e394141c56dbea711fb14a56c466ae46f81052e94ccb39' 
  AND token = 'bjUV+tkMpcXsmY1aTs+YQOPX3PUcDeswwynZhrkYdV4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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