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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79adcfcf17f7a3cb8b1256c5b85406756e774ea90a3a53363166363cb9412970' 
  AND token = '8EWb7ECMVyC8jrIObuUIHYuHQ3BbZHMSqahHkm/Rtz0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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