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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971f87233051f7e556d784201435f1f388eedffd8a7a4f423b284de628d3f9bd' 
  AND token = 'SGlU3eUdKjgrnLZ641eJHaYQZekXz8JE9fOQ5AdtxaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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