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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfd13c0c66540abb15fd342a7624abdd4425bb15bf66d06c33c5d6492f27a3e5' 
  AND token = 'wCgrnJ4I/AB0YfghNlMp6x/tjKsRTlrYDRb9kwSisPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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