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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfe31f875cb241424f63a8cdb0bac3fad4b294613caeafdca9bc751e4f4b026a' 
  AND token = 'Mx/d2oUiZ481hu4+eaqRRzjeIGRXbckPYwVOiNK09M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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