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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a41d56b091d02ff5bd95dff45c499700e8e5c2ce69984f8ade5305b751203ef4' 
  AND token = 'nQY9sP7FVoMHk3W525V73LDbsF18gx9B9ESgW412WSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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