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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840a59b8bf4c2e1be8a1cf6ab01b760b6b07c7357bc11faa1b6cf61aea978dc0' 
  AND token = 'sG/OYVlxbU/479e2d1hpmF8PanACmGJTvkiTOcGFIUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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