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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7d60ae86ceb29bdb8bd9ebe1e1e6915b98a99feafd654ad943ba9819623e309' 
  AND token = 'kan3jooXdF72JXqF8fvXgCiUwSkGIjtA1azRp4o6ZmA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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