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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcfc6e1ace6a84fed9a4a85f6c8dab06fdb921ed8fa1e2f6c28d6e6810987a33' 
  AND token = 'Y1hokavuKb2VLlIz8DVSuyEmj6WzMQTFYygxTU38DPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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