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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '230b6c1ed2dcd8d4f8daa58ec16a3cbcd60becde64e15dfb53b3adce69ae5b7e' 
  AND token = 'MV3Yql+GC0hENTsYrVpXKbdi4EV3ccO2h4D/TZ9aqBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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