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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e067e153059ed2150bb30f6a96d9f3850b7cbb134dda8e0917c6fd5d29e041a2' 
  AND token = 's4Ufb4gToHlTIWb1gQptDqNsbStJh6BXfaxFVnsx4jE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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