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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3481c3baa3fdf6014b554cc6c31faf109040f1c4b70930eeab9c8aeee816b031' 
  AND token = '9rkJg5hAy1yM+K/YkEc84lhk/zoxMMaqfhqgXHYMVjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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