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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb24d164bc2b515f303660a11d8a044c141566efcba1e7e513e9234ef3fde12d' 
  AND token = 'kzwPkfh5WdOsOUm7Rgjv+svPYv4v3XjgLJLsnAfqaJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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