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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09172cb07c095518e6af1b5b4e9a341588480e92fb5d842f222822f843b77ac7' 
  AND token = '1xQMdrFJFiPROXAp2Sv/hCyxbSawiL0qBusL9pD0OEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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