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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '698d83b878a7f1c31b7b2e8d51700b08e2af3c10a36ea6468671948a42dcb7d9' 
  AND token = 'agVbP3AtdLlznqqEl05qT45Se5Z5dYZ4dvM0ZolOqro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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