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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dca40f469264e76b458e8107be58e2e62a802cfc870f58b65ac0fa15c0d6511c' 
  AND token = 'jqmvQUPvc97P1fR+U9yiArrU4PXQXyCQJUA+XlcMG2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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