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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28863bcdd705b74199ad715ae363385ddc892781ca2cef8170e7e37a2dca9774' 
  AND token = 'QH6lEMAlVdY48IXQlyjNMM+9HUMhJzbA7DcpPnKsFok=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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