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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '668d5997b3c85878707a7c05c85f34c0cad8a5139165c32a9e6de45ecb2cf50d' 
  AND token = '7rsPPdQHlSgnQFlnK+bQhUKnNMQ/oxdPH6YRctXWzNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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