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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c7f8372391d6c1e4e2093da5b1d0dc8faada9ddf117ed2d392fca479106eff2' 
  AND token = 'YqN4Kqxxjq/kXpN559oQ2sOe6MVJiIOLXjCYYsHEGIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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