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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4828f8912bc76d73840411fd0bdeec02ac1c0c0f072f04732035c8790add7fea' 
  AND token = 'QwDralpbwDaoggCPHylfKc11d1XjKbU69E6g6qQ2BS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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