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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '824acbba7d2a721db2d06323372f19b0fe9c414cfa3f5d42dc12f4f0f26b37df' 
  AND token = 'GNmkgIgDAStzp0A9a84roz+sYqjf+8YM4h5wn1i0GWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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