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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07682dea995d2974841260c783d63ddf971c2a42664204fc75c3819c5c706d21' 
  AND token = 'WVEyETF7DgII/74aWIbXohyHhJQV1EQg2mTllTGtUB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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