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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4572de43b2eb32a9e7476c7203214c54c8431b5f6ea45821ad4297c6c66d8fcd' 
  AND token = 'LXnD6/tQN+YlwJXEZY7NrOxxBeRYuwJ4BFPOrm62Mq4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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