SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62aae0c91586bd7683b8a1cbbc807f74a0d3cda295e331895f2f04d59b38d2fd' 
  AND token = '1qCvjlruK8O1AN6Qwa1cdanB5PvuVptUB+yQYxifZJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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