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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '949576b95c9e4356ffcdc0857b602a95fb959e1fc954c4ba8352674a4c2c5cb8' 
  AND token = 'CB2IqqqHnYi71L7AmnEgSYrYgJTC/p9y9u9TQh/MaBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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