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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f62b665f6f618adabedbfe717cc7ecee99405439ce81b7dee63c4597edca7c' 
  AND token = 'Bbz9JY/jfb6aW029TTb9C62/4gEW+zS1OfVS2S0e0IU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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