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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '846539becc652d82da0bc1dd6462d73adb1403f774e23c4b63e5096e7380d6e7' 
  AND token = 'Zy4YhkhZBYNfldrvoqRExYq6aTt0RsVGInCcd38st2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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