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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e6adce3e88387508b2ebbd8f7c1cb5f01ce7b41ebff85847fc65e3e935d4480' 
  AND token = 'oPwPu2S16mIsafa3tzVfD4WPWhPNDULuI7syFBYJBW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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