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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b0d92b623efdabdfd8f5301b19903e0d5ecbd7364c825329d44c13130519eb8' 
  AND token = 'JZ47dmHsKWt//JYMut7bi/KOpNPzsVhurammyIyNK3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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