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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09e65a42a0ac752cc08a1978b132ac20c01e0d05926d5b6605d282b261dbb523' 
  AND token = '1bc5GVykHP7wN1n2nXE534zqawTOyXlYyICZ8y1FdnE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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