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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09193fe86cfb73c7061d9e639a10a21c4909116c9b99465129099fb3d7e95ba8' 
  AND token = 'S+/ZJDPqas98YTWhz6kteP5KBFVk8/k72nhjSaiRkxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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