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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e13680c1bcdfc45af079b46dab3e63d7fffdc74973f13d2824ff110b71e5f13' 
  AND token = 'oizx+uZ9WJ+4c6xbwFbT9hzFFJabZ6JFqAHvdZWgBkQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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