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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b1083a030d297709c10a66ec4dbdb16c851124ea04090a453f8847ea5210acc' 
  AND token = 'bdjzwIxzg/0wyQ3H+audpTY/SWBeqUAPX8kIFgRsGio=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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