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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040c645409fff9c05233bc2c453d1091b9cf00788fe3782df84ada7367718eb4' 
  AND token = 'nCfLkf3qCuLz4yjJBgE210IJrbS8yewFO5hajR8Ljbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00165

JSON explain

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