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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '116285c8b690039ee4dbaf95a7b3a79a5cddabd446fd27cf24a0ee9d67b3ae38' 
  AND token = 'z64w6K8bsbpsWVbOIAAW/lhQBtfaqQJKe7sUvlQnLww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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