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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26b6aaf1e8b4580c0f8243270c0cb5dc512416c034ee0bd57b8f908ba88c02f' 
  AND token = '4P9YcoX8WlbGGYWGmZhPhQq4cXSWB3yWPqm/wDJOcvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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