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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629bddb085b98134798233e1f927ba9e060daa4beee375ee282b0df012e4fa4b' 
  AND token = 'eUzZu+7EMsTX5IagXjP0M/Y8BbxQlg9qvAtqdElfriw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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