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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f09992966d4954628d929f9c1a99f7ea77e6f49e6b23a297eb9749bdd8d5d535' 
  AND token = 'fV+fAlrMvTXHQHYjktvcmM0ICmrtg8/wNtVTujI9JIw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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