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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3072eb9d4defa07d25b8b6ea99167941596d9ed7b24848b9a3ac89de15a63ee8' 
  AND token = 'lpR/hWfifLCAv8uwjpsJtapnN/mLXcxJz5HhL6jHwbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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