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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98ff2cd71062787d2523b7fdf5285386ceabe2cf88f339909b96d006a32f57cb' 
  AND token = '7LeIItF8Oqe13pr8wedkuKQRkOQ2ugW+koJfHXcGcQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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