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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab7bda0dbcdc5ecc9c132533fef1ff5801eb33115a1887da591c87af3c7dc34f' 
  AND token = '6StPD8/mjwigZXHcfGec5FTiWhAfnBKVHgYe3vtgJF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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