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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c200dd387d9460dc6d7cb24f9bc5b61ebe7d02d0d6360f3878bdac0f600e8e0' 
  AND token = 'VtZiJsW/AvUiNne5LhLUuB5oKTCzmoX+QE9kRCTP0ds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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