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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a48f9aa5a5f6ed5c4ae161d0ebabf9245f7916be80ed7eccdb10d29559d60ee' 
  AND token = 'vxYxoOokX5iHRR05DbfmnEd1kjCvakht4pMTVw9xvJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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