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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5caea6813e3fd5d5c907d2648e70e03a26996325672a001a57c71537c7b7a32a' 
  AND token = 'biu3AjuoYezblUJ3RRjC1TgMgussd5RaLyfCGwZxmk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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