SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cebd82961fe8e7aa154d5f9063d291114bef94e03c932687680924f960238ad6' 
  AND token = 'FwLsWIRRfDiEvCuF9MUP1VpGjljkUf5/yHcJrA1Zdlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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