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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25400c3056c7859c63920f760ea03c27cc9d8324d410690757e48c3d7a6394d2' 
  AND token = 'jCi6r76lMzBVfGJBjIFdVWuvojbHdInYexwqcC17rc8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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