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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f25afcb60adf92abe724f3221ee92e948391ca76ad73a2e31372ce69ec89f261' 
  AND token = 'PWx6YtQFr+jbC4T8JXYumvIUDqESJpf4CImUEqKhU+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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