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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f19d9476776b638bf82f6156c040375f896099b1e45435c6f81b7ba9d1eab152' 
  AND token = 'QTmPiwfWHwlnfMs7MhP/He8YnPV2ARAISlrmaPYurgY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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