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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a06f96dc7b6c157c0266b76f6a95022e2bcc3b352513754b28429351e01658' 
  AND token = 'eKRsLSaKQVgIFB6t8CmKmChKbL32xBMhkiOFsVg2uj8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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