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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '085675a48284abdcbba922138ed7d32c27d5df1e69a1399f1ecc34f3b1ec5f63' 
  AND token = 'ZFdcWlMclYQ12TFDgsEW9vLEisFHeisnDyLG+EQQew0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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