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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '186ba356227ee0ac7278c87e3f7db2ab85276b14c40d85e22aa2ecc2e6635c35' 
  AND token = '3O50zPg7XuW/QxojFvKUDzCXcKTQ6qkyeFGIhqArpKE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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