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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fc970b1612825b1dcfed2913b207802d53a36f612af39819e99cd71fcabf184' 
  AND token = '8DKHzF9ldzcYf15pLvbV3V6m3ANbU/0lMA1nNCgrz6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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