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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1b94df4e2a2e2e75c00a1f7f3686caeb4d7d4bbbbaed0f523085c05dc8d4ed9' 
  AND token = 'IRpvA0RZxy4+fHygeUoxxQQam6iOOBt8iSqNlK2F8UY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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