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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d71a2cababcea7c344180947d1cea67e26de57aa2ab4c26c83d86521bca6259' 
  AND token = 'a8gRzFnXF5JakKCEX6P0JhQ7+sImYQIdvymSDWYqlrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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