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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57a358f24e4df1c16948fcd4b951d41980242085754e0da7dd2c5eebdf028ea' 
  AND token = 'V8f7Z2rZgMgK98aw1sDbMRlo/IPmtSnVNIHwn+7d4TM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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