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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a321e81a529874efe60a648be2a0ec12d8e4ee95ac0d5d4c55958c89dc5f32' 
  AND token = 'qnqTmdVA/WJEUPN4CmeQXGjVwMapGw2+yyp25Y+SnOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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