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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f12509041b8d89e4b5f8e0a896248262b01830fa5ee0ba7ca031c233d9dd868' 
  AND token = 'Z4ospQHQkEY7c98p5jd56xgntCvKZUoisO6+gnHD3+Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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