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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad06ef09648f9824b8f7fa9ffa9dcc6e1bde14fc62bb4315aebc46b6aa490dd4' 
  AND token = '913w1kODA33/zmOf9fKJQnqLIJR9iHUFJICnzaGext4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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